The Wisconsin state Senate district was reliably red, a place where winning came easy to Republican candidates up and down the ticket.
But that’s come to an end.
Democrats on Tuesday won a surprising victory in Wisconsin’s Senate District 10, part of what’s become a wave of wins nationwide in state legislative and federal races, stoking concerns among Republicans ahead of the midterm elections this fall.
“Senate District 10 special election win by a Democrat is a wake up call for Republicans in Wisconsin,” tweeted Republican Gov. Scott Walker, who later Wednesday sent out several tweets that began with “WAKE UP CALL” and touted his party’s achievements in the...